DE69018101D1 - Optical scanner. - Google Patents

Optical scanner.

Info

Publication number
DE69018101D1
DE69018101D1 DE69018101T DE69018101T DE69018101D1 DE 69018101 D1 DE69018101 D1 DE 69018101D1 DE 69018101 T DE69018101 T DE 69018101T DE 69018101 T DE69018101 T DE 69018101T DE 69018101 D1 DE69018101 D1 DE 69018101D1
Authority
DE
Germany
Prior art keywords
optical scanner
scanner
optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE69018101T
Other languages
German (de)
Other versions
DE69018101T2 (en
Inventor
Yukio Kurata
Yoshio Yoshida
Yasuo Nakata
Takahiro Miyake
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of DE69018101D1 publication Critical patent/DE69018101D1/en
Application granted granted Critical
Publication of DE69018101T2 publication Critical patent/DE69018101T2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
    • G11B7/0903—Multi-beam tracking systems
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0916—Foucault or knife-edge methods
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/094—Methods and circuits for servo offset compensation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings
DE69018101T 1989-01-13 1990-01-12 Optical scanner. Expired - Lifetime DE69018101T2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1007105A JPH083910B2 (en) 1989-01-13 1989-01-13 Optical pickup device

Publications (2)

Publication Number Publication Date
DE69018101D1 true DE69018101D1 (en) 1995-05-04
DE69018101T2 DE69018101T2 (en) 1995-09-28

Family

ID=11656810

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69018101T Expired - Lifetime DE69018101T2 (en) 1989-01-13 1990-01-12 Optical scanner.

Country Status (6)

Country Link
US (1) US5128914A (en)
EP (1) EP0378438B1 (en)
JP (1) JPH083910B2 (en)
KR (1) KR930000039B1 (en)
CA (1) CA2007619C (en)
DE (1) DE69018101T2 (en)

Families Citing this family (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2763174B2 (en) * 1990-04-09 1998-06-11 松下電器産業株式会社 Optical pickup device
NL9002007A (en) * 1990-09-12 1992-04-01 Philips Nv DEVICE FOR SCANNING AN INFORMATION SHEET WITH OPTICAL RADIATION.
US5412631A (en) * 1992-07-10 1995-05-02 Matsushita Electric Industrial Co., Ltd. Optical head apparatus for storing, reading or erasing information, and optical information reproducing method and optical information apparatus for optically reading information stored in an optical memory
JPH07176095A (en) * 1993-06-25 1995-07-14 Nec Corp Magneto-optical head device
KR950015234A (en) * 1993-11-29 1995-06-16 배순훈 Optical pickup
US5544143A (en) * 1994-06-14 1996-08-06 Eastman Kodak Company Read/write laser-detector-grating unit (LDGU) with an orthogonally-arranged focus and tracking sensor system
US5491675A (en) * 1994-06-14 1996-02-13 Eastman Kodak Company Single return path orthogonally-arranged optical focus and tracking sensor system
FR2724042B1 (en) * 1994-08-30 1997-01-03 Thomson Csf OPTICAL WRITE / READ SYSTEM OF A RECORDING MEDIUM AND APPLICATION TO A RECORDING DISC
US5687152A (en) * 1994-10-25 1997-11-11 Kabushiki Kaisha Sankyo Seiki Seisakusho Optical pickup system
US5923631A (en) * 1995-09-07 1999-07-13 Canon Kabushiki Kaisha Optical information recording/reproducing apparatus including a beam axis adjusting device for adjusting a position of a beam incident to a diffraction grating
JP3372413B2 (en) * 1995-12-04 2003-02-04 シャープ株式会社 Optical pickup device and optical recording / reproducing device
US5783797A (en) * 1996-05-09 1998-07-21 Seagate Technology, Inc. Laser texturing of magnetic recording medium using a crystal material
WO1997042628A1 (en) * 1996-05-09 1997-11-13 Seagate Technology, Inc. Laser texturing of magnetic recording medium using multiple lens focusing
WO1997042629A1 (en) * 1996-05-09 1997-11-13 Seagate Technology, Inc. Magnetic recording medium with laser textured glass or glass-ceramic substrate
US5895712A (en) * 1996-05-21 1999-04-20 Seagate Technology, Inc. Magnetic recording medium with improved coercivity
US6020045A (en) * 1996-06-05 2000-02-01 Seagate Technology, Inc. Textured magnetic recording medium having a transition zone
US6021032A (en) 1997-01-15 2000-02-01 Seagate Technology, Inc. Magnetic recording medium with laser textured data zone
US5965215A (en) * 1997-01-15 1999-10-12 Seagate Technology, Inc. Method for laser texturing a landing zone and a data zone of a magnetic recording medium
US5952058A (en) 1997-01-15 1999-09-14 Seagate Technology, Inc. Laser texturing magnetic recording medium using fiber optics
US6207926B1 (en) 1997-01-15 2001-03-27 Seagate Technology Llc Fiber optic laser texturing with optical probe feedback control
JP3889104B2 (en) * 1997-02-07 2007-03-07 シャープ株式会社 Optical pickup device
US5853820A (en) * 1997-06-23 1998-12-29 Seagate Technology, Inc. Controlled laser texturing glass-ceramic substrates for magnetic recording media
US6068728A (en) * 1997-08-28 2000-05-30 Seagate Technology, Inc. Laser texturing with reverse lens focusing system
US5837330A (en) * 1997-08-28 1998-11-17 Seagate Technology, Inc. Dual fiber optic laser texturing
US5956217A (en) * 1997-08-28 1999-09-21 Seagate Technology, Inc. Reference disk for determining glide height
US5861196A (en) * 1997-09-25 1999-01-19 Seagate Technology, Inc. Laser texturing a glass or glass-ceramic substrate
US5945197A (en) * 1997-10-27 1999-08-31 Seagate Technology Laser texturing of magnetic recording medium using multiple lens focusing
US6411573B1 (en) 1998-02-20 2002-06-25 Zen Research (Ireland), Ltd. Multi-beam optical pickup
JP3638210B2 (en) 1998-06-15 2005-04-13 シャープ株式会社 Hologram laser unit and optical pickup device using the same
US6093472A (en) * 1999-06-23 2000-07-25 Seagate Technology, Inc. Magnetic recording medium with laser textured glass or glass-ceramic substrate
US6468596B1 (en) 1999-07-15 2002-10-22 Seagate Technology Llc Laser-assisted in-situ fractionated lubricant and a new process for surface of magnetic recording media
US6891791B1 (en) 1999-08-19 2005-05-10 Interscience, Inc. Optical pickup apparatus and method
US6587297B1 (en) * 2000-02-18 2003-07-01 Robin Reinhard Padden System and method for detecting the presence of a data-storage cartridge using phase-rotated polarized light
TW501116B (en) 2000-07-05 2002-09-01 Matsushita Electric Ind Co Ltd Optical device, optical semiconductor device, and optical information processor comprising them
JP3805194B2 (en) * 2000-12-07 2006-08-02 株式会社日立製作所 Optical information reproducing device
JP3972741B2 (en) * 2002-06-21 2007-09-05 ヤマハ株式会社 Optical disk recording device
JP4083720B2 (en) * 2004-09-17 2008-04-30 シャープ株式会社 Optical pickup device
KR100756042B1 (en) * 2005-01-19 2007-09-07 삼성전자주식회사 Diffraction element and Optical pick-up apparatus having the same
KR100754517B1 (en) 2005-01-20 2007-09-03 삼성전자주식회사 Diffraction element and optical pick-up apparatus having the same

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742506A (en) * 1984-07-12 1988-05-03 Sony Corporation Tracking error detecting apparatus for an optical head with skew error reduction by using an inclined header portion
US4750162A (en) * 1985-07-16 1988-06-07 Victor Company Of Japan, Ltd. Optical tracking system utilizing three photo-detectors
DE3680865D1 (en) * 1985-11-11 1991-09-19 Sharp Kk OPTICAL HEAD.
EP0228620B1 (en) * 1985-12-10 1991-06-05 Nec Corporation Optical head comprising a diffraction grating for directing two or more diffracted beams to optical detectors
US4794585A (en) * 1986-05-06 1988-12-27 Lee Wai Hon Optical head having a hologram lens and polarizers for use with magneto-optic medium
DE3778670D1 (en) * 1986-12-25 1992-06-04 Nec Corp OPTICAL HEAD.
JPH0675300B2 (en) * 1988-04-11 1994-09-21 三菱電機株式会社 Optical head device
JPH0770065B2 (en) * 1988-04-20 1995-07-31 シャープ株式会社 Optical pickup device
US5049732A (en) * 1988-10-21 1991-09-17 Sharp Kabushiki Kaisha Optical pickup device with diffraction device

Also Published As

Publication number Publication date
EP0378438A2 (en) 1990-07-18
JPH02187936A (en) 1990-07-24
KR900012219A (en) 1990-08-03
CA2007619C (en) 1995-04-04
DE69018101T2 (en) 1995-09-28
JPH083910B2 (en) 1996-01-17
CA2007619A1 (en) 1990-07-13
EP0378438A3 (en) 1991-11-21
US5128914A (en) 1992-07-07
KR930000039B1 (en) 1993-01-06
EP0378438B1 (en) 1995-03-29

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8328 Change in the person/name/address of the agent

Free format text: PATENTANWAELTE MUELLER & HOFFMANN, 81667 MUENCHEN